308 Analyses of Books. , [Oct. 



I. Htidrophifllum comprehends the species, 1. Appendiculatum, 

 from tlie Alleghanies ; 2. Canadense ; 3. Virginicum ; 4. Macro- 

 phffUum, near the Columbia. 



IT. Ellisia. 1. Ntjctelea, Potowmac and Missouri ; 2. Ambigua, 

 Missouri ; 3. Membranacea California ; 4. Crtjs ant hemif alia 

 California ; 5. Microcalyx ; 6. Ranunculacca. 



III. Nemophila. 1. Paviflora Columbia ; 2. Pedunculata 

 Columbia; 3. Pkaceloides ; 4. ^wri to California; 5. Insignis 

 California; 6. Menziezii. 



IV. Eutoca. 1. Douglasii California; 2. Cumingii Chili; 

 3. Brachyloba Califorma; 4. Mexicana; 5. Parvijlora Fensjl- 

 vania; 6. Loasatfolia California; 7- Franklinii ; 8. Menziezii 

 California; 9. Sericea ; 10. Grandijlora California; 11. Divari- 

 cala California ; 12. Phaceloides California. 



V. Phacelia. 1. Malvaefolia California ; 2. Brachyantia Chili ; 

 3. Circinata Columbia ; 4. Integrifolia Platte ; 5. Ciliata Cali- 

 fornia; Q. Ramosissima California; ^, TanacetifoliaCAiioxmo.; 

 8. BipinnitiJidaA]leghainies; 9. Fimbriata Kentucky; 10. Hir- 

 suta; 11. Glabra. 



VI. Emmenanthe Pendulijlora California. 



Of these species 19 were sent from the western parts of North 

 America, by the indefatigable Mr. Douglas, who, unfortunately, lost 

 his life in the Sandwich Islands, during the prosecution of his bota- 

 nical researches. 



The chief interest of the genus Diopsis arises from the extraordi- 

 nary elongation of the sides of the head into two cylindrical horns, 

 which, in some instances, are as long as the whole body, and at the 

 extremity of which, the eyes, of a semi-globular form, are placed. 

 The antennae, also, are inserted near the extremity of these protu- 

 berances, at a short distance before the eyes. These horns, at first 

 sight, might be mistaken for antennae, but they are inarticulated at 

 the base, as well as along the surface ; they have, therefore, no inde- 

 pendent motion, their movements being, necessarily, accompanied by 

 those of the whole head. When, however, we recollect that they 

 contain not only the infinity of nerves of the compound eyes at their 

 extremities, but also those producing the sensation, of which the an- 

 tennae are the seat, we can easily imagine how necessary it is that 

 the means of communication with the remainder of the head should 

 be unbroken by articulation. Mr. Westwood describes 21 species: 

 1 . Ichneumonea Guinea. 2. Collaris Senegal. 3. Pallida. 4. 

 Nis:ra Sierra Leone. 5. ApicaliH Sierra Leone. 6. Tenvipes 

 Senegal. 7* Indica Bengal. 8. Afisimilis. 9. Abdominalis. 

 10. Furmpennis. Senegal. I \. Pur. ctiger Went Africa. 12. Sig- 

 nata Sierra Leone. 13. Fascia fa. 14. Concolor- West Africa. 

 ]/). Macrophfhalma Sierra Leone. 16. Thoracica West Africa. 

 17. Ohftcnra Sierra Leone. 18. Confusa Congo, Sumatra. 19. 

 Dalmanni Java. 20. Sykesii East Indies. 21. Brevicornis 

 Pennsylvania. 



This paper is illustrated by engravings of twenty figures. 



